Updating VMware ESXi on a DL560 host

[M. N.]

I am configuring a DL560 host to be joined to a VMware vSphere infrastructure.

I used USB keys to install the HP version of ESXi 5.5 U2.

At the moment the server runs ESXi standalone and is not managed by any vCenter server. 

I need to install VMware and HP patches before joining it to the existing vShpere infrastructure.

What is the best and simplest way to install VMware and HP patches before joining the host to the vSphere infrastructure?

Regards

M.N.

PS: I hope this is the right forum for my question. If it isn't, can anybody please point me to the right forum?